package main

import "fmt"

func main() {
	a := make(map[string]int)
	b := map[string]int{}
	c := map[string]int{
		"allen": 20,
		"luffy": 19,
	}
	var d map[string]int

	fmt.Printf("a = %v\n", a)
	fmt.Printf("b = %v\n", b)
	fmt.Printf("c = %v\n", c)
	fmt.Printf("d = %v\n", d)

	a["allen"] = 10
	b["allen"] = 10
	c["allen"] = 10
	//d["allen"] = 10

	fmt.Printf("a = %v\n", a)
	fmt.Printf("b = %v\n", b)
	fmt.Printf("c = %v\n", c)
	fmt.Printf("d = %v\n", d)

}
